Feeling warmer than usual, often accompanied by increased sweating and occasional hot flashes, is a common physiological change during gestation. Pregnancy significantly alters the body’s thermal regulation system, leading many individuals to feel consistently overheated. This sensation is a normal response as the body works to support the growing fetus. Understanding the timing of this symptom and its underlying causes can help manage the discomfort throughout the nine months.
The Onset and Progression of Thermal Changes
The feeling of being hot often begins early in the pregnancy, sometimes even before a missed menstrual period. This immediate onset is primarily a result of rapid hormonal shifts, which influence the body’s temperature set point. Hot flashes can begin within the first 20 weeks of pregnancy for about one-fifth of pregnant individuals.
This sensation of warmth tends to fluctuate but often intensifies as the pregnancy progresses into the second and third trimesters. The body’s metabolic rate and blood volume continue to rise substantially during these later stages. By the third trimester, the size of the fetus and the added weight also contribute to the feeling of being hot, as the body works harder. The feeling of being overheated typically peaks towards the end.
Why Pregnancy Increases Your Internal Temperature
Several physiological changes contribute to the increased sensation of heat during pregnancy. One major factor is the hormonal shift, especially the surge in progesterone. Progesterone naturally raises the body’s basal temperature set point, similar to what occurs after ovulation, leading to a feeling of warmth.
The cardiovascular system also changes to support the developing baby. Blood volume can increase by up to 50% by the 34th week of pregnancy, requiring the heart to pump blood up to 20% faster by the eighth week. This higher cardiac output and increased circulating blood generate more heat internally. The body’s metabolic rate elevates as it works harder to support the growth and maintenance of the fetus, which naturally produces excess heat.
To counteract this internal temperature rise, the body employs a process called peripheral vasodilation. This causes blood vessels near the skin’s surface to widen, allowing more blood flow to the skin. While this mechanism attempts to dissipate heat, it often results in the characteristic flushed skin and sensation of heat or “pregnancy glow.” The body’s core temperature is elevated by about 0.2 degrees Fahrenheit above the normal temperature range.
Simple Ways to Stay Cool and Comfortable
Managing the constant feeling of warmth involves making simple adjustments to daily habits and environment. Staying well-hydrated is important, as the increased heat and sweating can quickly lead to dehydration. Aiming for at least eight to twelve cups of fluid daily is recommended, with increased intake on warm days or after physical activity.
Choosing the right clothing makes a noticeable difference in comfort levels. Loose-fitting garments made from natural, breathable fabrics such as cotton or linen allow air to circulate and help wick away moisture. Light-colored clothing is preferable, as dark colors absorb more heat from the environment.
Cooling Strategies
Incorporating water and environmental controls offers further relief:
- Use environmental controls, such as a fan or air conditioning, for direct relief, and keep a small, personal fan handy for quick cool-downs.
- Take a lukewarm shower or bath before bed to help lower the core body temperature without causing a rebound effect of shivering.
- Placing a cool washcloth or ice pack wrapped in a towel on pulse points, such as the back of the neck or wrists, can also provide immediate relief.
- Plan errands and outdoor activities for the cooler parts of the day, avoiding the sun’s peak intensity between 10 a.m. and 4 p.m.
When to Consult a Healthcare Provider
While feeling hot is a normal pregnancy symptom, it is important to distinguish this sensation from a true fever or signs of heat-related illness. A temperature of 100.4 degrees Fahrenheit (38 degrees Celsius) or higher is considered a fever and should not be ignored. If a fever occurs, consult a healthcare provider to determine the cause, as it can indicate an underlying infection that requires treatment.
Signs of severe dehydration or heat exhaustion also require immediate attention. These symptoms can include dark urine, decreased urine output, persistent dizziness or lightheadedness, or a severe headache. If the feeling of excessive heat is accompanied by other concerning symptoms, such as severe chills, abdominal pain, or a rapid heart rate, contacting a medical professional is recommended. Untreated fevers, particularly in the first trimester, have been associated with potential risks.